add program files

tests/test_logging.py

@@ -0,0 +1,12 @@
+from __future__ import annotations
+
+from audiobooksorter.logging import configure_logging
+
+
+def test_configure_logging_reuses_logger() -> None:
+    logger = configure_logging("audiobooksorter-tests")
+    logger.info("hello")
+    # calling again should not attach additional handlers
+    logger_again = configure_logging("audiobooksorter-tests")
+    assert logger is logger_again
+    assert len(logger.handlers) == 1